Hypnosis is actually a trance like state wherein the subject is fully engaged to an extent that what he is focused on is what seems real to him. The most common forms of hypnosis are those that are done by ourselves. Reading an engaging book
Yes, it’s true that most professionals who practice hypnosis would have you close your eyes. And it’s also true that no one ever does anything against his/her will or anything that would be immoral. Now, that’s not to say that some people don’t do immoral things as I’m sure you’ve seen others do immoral acts and they never went to a hypnotist. And yes, some will do outrageous things all on their own without the aid of a hypnotist.
So why close the eyes? The most famous hypnotist of all times, Milton Erickson, rarely had his patients close their eyes. He was the master at wakened hypnosis–giving suggestions without having one close their eyes.